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GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath() (#101665)

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GH-101362: Call join() only when >1 argument supplied to pathlib.PurePath

This reduces the time taken to run `PurePath("foo")` by ~15%
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Barney Gale 2023-03-05 22:00:56 +00:00 • committed by GitHub
parent 96e1022929
commit 3572c861d8
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2 changed files with 6 additions and 1 deletions
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5
Lib/pathlib.py
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@ -275,9 +275,12 @@ class PurePath(object):
def _parse_parts(cls, parts):
if not parts:
return '', '', []
elif len(parts) == 1:
path = os.fspath(parts[0])
else:
path = cls._flavour.join(*parts)
sep = cls._flavour.sep
altsep = cls._flavour.altsep
path = cls._flavour.join(*parts)
if altsep:
path = path.replace(altsep, sep)
drv, root, rel = cls._flavour.splitroot(path)

2
Misc/NEWS.d/next/Library/2023-02-07-21-16-41.gh-issue-101362.KMQllM.rst Normal file
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@ -0,0 +1,2 @@
Speed up :class:`pathlib.PurePath` construction by calling
:func:`os.path.join` only when two or more arguments are given.